Valve electric device is an indispensable device to realize valve program control, automatic control and remote control. Its motion process can be controlled by stroke, torque or axial thrust. Because the working characteristics and utilization rate of valve electric devices depend on the type of valve, the working specifications of the device and the position of the valve on the pipeline or equipment, the correct selection of valve electric devices can prevent overloading (the working torque is higher than the control Torque) is critical. In general, the basis for the correct choice of valve electric device is as follows:
Operating torque: The operating torque is the most important parameter for selecting the valve electric device. The output torque of the electric device should be 1.2 to 1.5 times the maximum valve operating torque.
Operating thrust: There are two types of host structure of the valve electric device: one is to directly output torque without the thrust disk; the other is to configure the thrust disk, and the output torque is converted to the output thrust through the stem nut in the thrust disk.
Number of rotations of the output shaft: The number of rotations of the output shaft of the valve electric device is related to the nominal diameter of the valve, the pitch of the valve stem, and the number of thread heads. It should be calculated according to M = H / ZS (M is the total rotation that the electric device should meet Number of turns, H is the valve opening height, S is the thread pitch of the stem transmission thread, and Z is the number of stem thread heads).
Stem diameter: For multi-turn type bright stem valves, if the maximum stem diameter allowed by the electric device cannot pass through the stem of the valve, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow output shaft of the electric device must be larger than the outer diameter of the stem of the bright stem valve. For the part of the rotary valve and the multi-turn valve of the dark-stem valve, although the passage of the stem diameter need not be taken into consideration, the diameter of the stem and the size of the keyway should be fully taken into consideration when matching, so that it can work normally after assembly.
Different valve devices are used for different types, with different price and quality, the fields of use are different. The valve device selected by many units will cause more or less overload after it is used. In fact, before you buy, you must explain what you are using. Do not buy it blindly, and choose the inappropriate one.
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